Submission #399185

#	Time	Username	Problem	Language	Result	Execution time	Memory
399185		snasibov05	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1095 ms	3116 KiB

shoes

#include "shoes.h"

using namespace std;

long long count_swaps(vector<int> s) {

    int n = s.size();
    long long ans = 0;

    for (int i = 0; i < n; i += 2) {
        if (s[i] == -s[i+1]){
            if (s[i] > 0) ans++;
            continue;
        }
        
        int k = i+1;
        while (s[k] != -s[i]) k++;

        for (int j = k-1; j > i; --j) {
            swap(s[j], s[j+1]);
            ans++;
        }
        
        if (s[i] > 0) ans++;
    }
    
    return ans;

}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 15